I think you should have said sure he can study with the borg on the condition that you can be there! So he could see first hand that these bozos can't argue the bible and don't know what they are talking about! As it is now in five or ten years they may catch him at a weak moment and wiggle into him like the parisites they are! If you show him NOW what clowns they are he will be better protected for the long term!